Test Equipment and Measurements Flashcards

What instrument is used to measure the standing wave ratio (SWR) on a transmission line?

Answer: SWR meter (directional wattmeter)

An SWR meter (or directional wattmeter) measures forward and reflected power on a transmission line to calculate the standing wave ratio.

What does a spectrum analyzer display?

Answer: Signal amplitude versus frequency

A spectrum analyzer displays signal amplitude (usually in dBm) as a function of frequency, allowing visualization of harmonics, spurious signals, and bandwidth.

What is the function of a signal generator in RF testing?

Answer: To provide a known, calibrated test signal at a specified frequency and amplitude

A signal generator produces a stable, calibrated output signal used to test and align receivers, filters, and other RF equipment.

What does an oscilloscope primarily measure?

Answer: Voltage as a function of time

An oscilloscope displays voltage waveforms as a function of time, allowing measurement of amplitude, frequency, period, and waveshape.

What is a dummy load used for in radio testing?

Answer: To provide a non-radiating resistive load for testing transmitters without transmitting over the air

A dummy load is a non-inductive resistive load that absorbs transmitter power without radiating, allowing testing and adjustment without causing interference.

What is the purpose of a frequency counter in radio equipment testing?

Answer: To accurately measure the frequency of an oscillator or transmitted signal

A frequency counter counts the number of cycles of a signal per second to provide a precise digital readout of the operating frequency.